JP2864495B2 - Serial printer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink ribbon guide structure of an impact type printer such as a wire dot printer.

[Conventional technology]

As a conventional technique, as shown in FIG. 4, a thin ribbon mask 11 attached to a ribbon mask holder 12 is fastened to a carriage 15 via a screw 10.

Another conventional technique is described in Japanese Utility Model Laid-Open No. 57-98849. This uses a ribbon guide 29 which is inserted into the print head 26 while guiding and holding the ink ribbon 23 as shown in FIG.

[Problems to be solved by the invention]

However, in such a conventional serial printer,
In order to ensure stable running of the ink ribbon 13 and the printing paper 18, preparation work at the time of assembly is indispensable in order to accurately tighten the position of the ribbon mask 11 interposed between the printing head 16 and the platen 17. Was. Also, in order to improve the assembling accuracy, the ribbon mask holder 12, the carriage 15
There is a problem that extremely high shape accuracy is required for the above-mentioned parts. In addition, the ribbon mask holder 12 and platen 17 prevent the total paper thickness from increasing in the binding margin and the paper floating at the perforation, as seen in continuous form paper with copy paper.
Since the interval is constant, there is also a problem that a load is applied to the travel of the printing paper 18 and a printing paper feeding accuracy defect occurs.

In a serial printer in which the ribbon guide 29 is inserted into the print head 26, the running of the ink ribbon 23 is ensured, but when the print paper 28 is supplied to the front of the print head 26, the leading end of the print paper is higher than the platen 27. In addition to floating and ink stains, there is a problem that the printing paper 28 and the ink ribbon 23 come into contact during printing and print stains occur.

Accordingly, the present invention is to solve such a conventional problem, and an object of the present invention is to provide a serial printer which is inexpensive and easy to assemble.

Further, since the conventional serial printer has the above-described problem, it is more difficult to secure the paper feeding accuracy in a state where there is no print stain as the speed increases. Further, when printing exceeding 400 cps, the printing density on the left and right in the same line occurs unless the running speed of the ink ribbon is increased.
However, when the traveling speed of the ink ribbon is increased, there is a problem that the ink ribbon deviates vertically from the traveling route.

Therefore, another object of the present invention is to provide an ultra-high-speed serial printer which is inexpensive and easy to assemble.

[Means for solving the problem]

In order to solve the above problems, a serial printer according to the present invention is a serial printer in which a carriage that reciprocates in a longitudinal direction of a platen is provided with a print head that prints characters and symbols on print paper via an ink ribbon. ,
A ribbon holder that can be displaced along the surface of the printing paper is attached to a common holder shaft that stands on the carriage, and a ribbon holder that slidably holds the ink ribbon is attached to the common holder shaft. It is attached integrally.

(Operation)

When printing is performed with the serial printer configured as described above, since the ribbon mask and the ribbon mask holder are loosely fitted to the holder shaft, the total paper thickness at the binding margin found in continuous form paper with copy paper is used. Stabilizes printing paper movement against paper changes at perforations, guarantees paper feeding accuracy, and holds the ink ribbon by the ribbon guide, so that the ribbon mask contacts the ink ribbon. On the other hand, even when the traveling speed of the ink ribbon is increased, deviation of the ink ribbon from the traveling path is prevented, so that the ink ribbon can travel stably.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, a plurality of projections 1a and 1b having a height not less than the thickness t of the ink ribbon 3 are provided on the ink ribbon running side of the thin plate-shaped ribbon mask 1. The ribbon mask 1 is fixed to a ribbon mask holder 2 by an adhesive, a double-sided tape, ultrasonic welding, or the like. Ribbon mask holder 2
Is loosely fitted to the carriage 5 by the holder shaft 4.

If this part is explained in detail, as shown in FIG.
The hole 2a of the ribbon mask holder 2 and the holder shaft 4a have a gap of ΔR in the radial direction.

As described above, since the ribbon mask holder 2 is loosely fitted to the printing paper 8 mounted on the platen 7, the total paper thickness change at the binding margin of the continuous form paper with the copy paper and the paper floating at the perforation are prevented. I can run smoothly. In particular, when a push tractor mechanism in which the printing paper 8 is pushed in from the upstream side of the platen 7 is adopted as the paper feeding method, the gap between the ribbon mask holder 2 and the platen 7 changes depending on the state of the printing paper 8 and the form of the printing paper 8 is changed. Since the ribbon mask 1 follows the change, the printing paper 8 can be run without applying a load to the printing paper 8. Therefore, the printing paper 8 can travel without generating slack, and the paper feeding accuracy can be guaranteed.

In the embodiment as described above, by loosely fitting the ribbon mask holder 2 to the carriage 5, it is not necessary to apply a load to the travel of the printing paper 8. Also, protrusions on the ribbon mask 1
1a and 1b, the ribbon mask 1 is positioned at a predetermined distance in front of the print head 6, and the ink ribbon 3 runs at a constant speed.

Next, as shown in FIG. 2, a ribbon guide 9 is suspended on the path of the ink ribbon 3 described above, and the ribbon guide 9 is mounted on the holder shaft 4 described above.

When this portion is described in detail, as shown in FIG. 3, the ribbon guide 9 has the ink ribbon 3 previously sandwiched between the claw portions 9a and 9b and the joint portion 9c, and is in a state of being previously suspended on the ink ribbon 3. Is set. When the ink ribbon 3 is mounted on the printer main body, the ribbon guide 9 is mounted on the holder shaft 4, so that the vertical movement of the ink ribbon 3 is regulated by the guide portions 9d and 9e of the ribbon guide 9. Therefore, the ink ribbon 3 does not deviate from the traveling route even during its own high-speed traveling. The same effect can be obtained by mounting the ribbon guide 9 on the ribbon mask holder 2, the carriage 5, and the print head 6.

〔The invention's effect〕

As described above, the serial printer of the present invention
The ribbon mask is attached to the common holder shaft set up on the carriage so as to be displaceable along the surface of the printing paper, and a ribbon mask holder that slidably holds the ink ribbon is integrated with the common holder shaft. , Which stabilizes the running of the printing paper against fluctuations in the total paper thickness at the binding margin and the paper floating at the perforation, which can be seen in continuous form paper with copy paper, and guarantees the paper feeding accuracy. As a result, it is possible to reliably prevent the ribbon mask from coming into contact with the ink ribbon, so that even if the ink ribbon travel speed is increased, the ink ribbon is reliably prevented from deviating from the travel path, so that the ink ribbon is stable. There is an effect that you can run.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a loose fitting portion of a ribbon mask holder according to one embodiment of the present invention. FIG. 2 is a longitudinal sectional view of one embodiment provided with a ribbon guide. FIG. 3 is an explanatory view seen from the front of one embodiment provided with a ribbon guide. FIG. 4 is a longitudinal sectional view of a conventional serial printer. FIG. 5 is a cross-sectional view of another conventional serial printer. 1. Ribbon mask 2. Ribbon mask holder 4. Holder shaft

Claims (1)

(57) [Claims] 1. A serial printer comprising a carriage which reciprocates in the longitudinal direction of a platen and a print head which prints characters and symbols on print paper via an ink ribbon. A ribbon mask holder is attached to the holder shaft so as to be displaceable along the surface of the printing paper, and a ribbon holder for slidably holding the ink ribbon is integrally attached to the common holder shaft. A serial printer.